If you have enough RAM memory in Linux you can create a virtual disk as shown in this video. When you select the virtual disk as swap file the performance gain that can be achieved thanks to parallel disk I/O can be spectacular.
sudo mount -t tmpfs -o size=16g tmpfs /mnt/ramdisk
Note: for safety exit PixInsight before mounting the RAM disk.
Configuration example:
Your donation helps to keep PixInsight Resources fresh and updated. If you liked the site, you may want to invite us a coffee : ) Thank You!